A novel viscoelastic microfluidic platform for nanoparticle/small extracellular vesicle separation through viscosity...

Area of Science:

• Biotechnology
• Nanotechnology
• Biomedical Engineering

Background:

• Small extracellular vesicles (sEVs) are crucial for intercellular communication but challenging to isolate from complex biofluids.
• Existing separation methods like ultracentrifugation and immunoaffinity capture have limitations in complexity, cost, and recovery.

Purpose of the Study:

• To develop an innovative microfluidic approach for efficient and label-free separation of sEVs.
• To leverage viscosity gradient-induced forces for size-dependent particle separation.

Main Methods:

• Utilized viscoelastic microfluidics to create a viscosity gradient.
• Exploited size-dependent forces within the gradient to separate nanoparticles and sEVs.
• Validated the method with fluorescent nanoparticles and real biological samples.

Main Results:

• Demonstrated efficient separation of nano-sized particles and sEVs from larger impurities.
• Achieved approximately 80% purity and 80% recovery rate for target sEVs.
• Showcased the device's efficacy in separating sEVs from biological samples.

Conclusions:

• The developed viscoelastic microfluidic approach offers a promising, label-free platform for sEV separation.
• This method overcomes limitations of conventional techniques, enabling efficient isolation for research and clinical applications.